L4931ABDT120R Integrated Circuits (ICs)

Current - Output:	250mA
Base Part Number:	L4931AB
Supplier Device Package:	DPAK
Package / Case:	TO-252-3, DPak (2 Leads + Tab), SC-63
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C
Protection Features:	Over Current, Over Temperature
Control Features:	--
PSRR:	64dB ~ 55dB (120Hz ~ 10kHz)
Current - Supply (Max):	7mA
Current - Quiescent (Iq):	1.6mA
Series:	--
Voltage Dropout (Max):	0.8V @ 250mA
Voltage - Output (Max):	--
Voltage - Output (Min/Fixed):	12V
Voltage - Input (Max):	20V
Number of Regulators:	1
Output Type:	Fixed
Output Configuration:	Positive
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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Introduction to the L4931ABDT120R

The L4931ABDT120R is a low drop-out regulator (LDO), a type of voltage regulator. LDOs are special types of linear regulators, which provide stability at low voltage levels, compared to traditional voltage regulators. LDOs are known as “low-drop-out” because they allow a very small drop in the input voltage before they start to regulate it. The L4931ABDT120R is a very efficient device, offering high power efficiency and low noise.

Application Fields for the L4931ABDT120R

The L4931ABDT120R is widely used in numerous applications, across a variety of fields. The most common applications for this device include power supplies for microprocessors, embedded systems and voltage-flash memory. The regulator is also suitable for use in mobile and portable equipment, such as mobile phones and PDAs. Additionally, the L4931ABDT120R is used in battery-powered systems, as it can regulate voltage levels when interfaced with battery packs. Due to its wide operating range, excellent regulation accuracy and very low dropout voltage, the L4931ABDT120R is also well suited to automotive applications, including those in engine, body electronics and navigation systems. The device’s high power efficiency and tight line and load regulations make it a suitable regulator for high-precision medical instrumentation as well as a variety of consumer electronic products.

Working Principles of the L4931ABDT120R

The L4931ABDT120R is a linear regulator, meaning it works by regulating input voltage and current to prevent damage from overloads or improper voltage levels. This is achieved by controlling the amount of power the output is allowed to draw from the input. The device works on the principle of a shunt regulator, where a control element (typically a transistor) allows current to be diverted away from the output. When the identity of the input voltage level is detected, the control element shunts current away from the output, thus restricting the amount of power drawn from the input. The L4931ABD120R is a very efficient device, offering power efficiency higher than 90%. It follows the same PMOS architecture as most LDOs, using an operational amplifier and a PMOS transistor to maintain stable output power within a specific range. Furthermore, the device is designed to maintain accuracy even through extreme temperatures, thanks to its on-board built-in temperature compensation operation.

Conclusion

In conclusion, the L4931ABDT120R is a low drop-out regulator, which is widely used in many applications across a variety of fields. Due to its wide operating range, excellent regulation accuracy, very low dropout voltage and high power efficiency it is ideal for a variety of applications, such as microprocessors, embedded systems, mobile phones, PDAs and automotive systems. The device works on the principle of a shunt regulator, where a control element allows current to be diverted away from the output, thus maintaining stable output power.

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